Patent US4489040A successfully refreshed from Google Patents.
US4489040A
Expired / Lapsed
US
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Corrosion resistant nickel-iron alloy
Assignee: Haynes International Inc
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Filing: 1982-04-02
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Granted: 1984-12-18
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Expires: 2002-04-02
Abstract
Abstract Disclosed is an alloy eminently suited for use as a tubular product in deep, sour gas operations. The alloy has an optimum combination of corrosion resistance, high strength in the cold worked condition and resistance to sulfide stress cracking and stress corrosion cracking. A typical alloy contains, in weight percent, 0.03 carbon, 22 chromium, 36 iron, 3 molybdenum, 1 manganese, 36 nickel, 0.60 silicon, 0.15 nitrogen, up to 3 tungsten and incidental impurities including copper, cobalt, columbium, tantalum and titanium.
Inventors
- 👤 Aziz I. Asphahani
- 👤 Eugene W. Kelley
- 👤 Juri Kolts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:06
CPC Classifications
C; C22; C22C; C22C30/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
An alloy suitable for use in deep sour gas wells consisting essentially of, in weight percent, 0.001 to 0.06 carbon, 20 to 24 chromium, 2 to 4.5 molybdenum, up to 2.5 manganese, 34 to 38 nickel, up to 1 silicon, up to 3.5 tungsten, 0.03 to 0.35 nitrogen, up to 0.75 copper, up to 4 cobalt, up to 1 columbium plus tantalum, up to 0.25 titanium and the balance iron and incidental impurities, provided that the iron-to-nickel ratio is between 0.8 and 1.2 to 1 to provide the combined characteristics of corrosion resistance, high strength in the cold-worked condition and resistance to sulfide stress cracking and stress corrosion cracking.
Claim 2
Dependent Claim
109 words
An alloy suitable for use in deep sour gas wells consisting essentially of, in weight percent, 0.001 to 0.06 carbon, 20 to 24 chromium, 2 to 4.5 molybdenum, up to 2.5 manganese, 34 to 38 nickel, up to 1 silicon, up to 3.5 tungsten, 0.03 to 0.35 nitrogen, up to 0.75 copper, up to 4 cobalt, up to 1 columbium plus tantalum, up to 0.25 titanium and the balance iron and incidental impurities, provided that the iron-to-nickel ratio is between 0.8 and 1.2 to 1 to provide the combined characteristics of corrosion resistance, high strength in the cold-worked condition and resistance to sulfide stress cracking and stress corrosion cracking.
Claim 3
Dependent Claim
61 words
The alloy of claim 1 wherein the carbon is 0.005 to 0.05, the chromium is 21 to 23, the molybdenum is 2 to 4, the manganese is 0.5 to 1.5, the silicon is 0.25 to 1, the nitrogen is 0.10 to 0.20, the copper is up to 0.5, the cobalt is up to 3, and the titanium is up to 0.2.
Claim 4
Dependent Claim
35 words
The alloy of claim 1 containing about 0.03 carbon, about 22 chromium, about 3 molybdenum, about 1 manganese, about 36 nickel, about 0.6 silicon, about 0.15 nitrogen, wherein the ratio of Fe:Ni is about 1:1.
Claim 5
Dependent Claim
28 words
The alloy of claim 1 containing about 0.016 carbon, about 22.0 chromium, about 3.10 molybdenum, about 0.90 manganese, about 36 nickel, about 0.55 silicon and about 0.12 nitrogen.
Claim 6
Dependent Claim
28 words
The alloy of claim 1 containing about 0.02 carbon, about 22 chromium, about 2.9 molybdenum, about 0.9 manganese, about 36.5 nickel, about 0.6 silicon, and about 0.05 nitrogen.
Claim 7
Dependent Claim
27 words
The alloy of claim 1 containing about 0.04 carbon, 22 chromium, about 2.95 molybdenum, about 0.8 manganese, about 37 nickel, about 0.4 silicon, and about 0.228 nitrogen.
Claim 8
Dependent Claim
35 words
The alloy of claim 1 containing about 0.02 carbon, about 22 chromium, about 35.5 iron, about 1 manganese, about 3 molybdenum, about 0.15 nitrogen, about 36.8 nickel, about 0.56 silicon and the balance incidental impurities.
Claim 9
Dependent Claim
22 words
The alloy of claim 1 in the form of cold worked tubular product suitable for use in deep, sour gas well applications.
Claim 10
Dependent Claim
20 words
The alloy of claim 1 in the form of a casting, plate, thin sheet, tubing, metal powder or wire rod.
Claim 11
Dependent Claim
14 words
The alloy of claim 1 in the form of an article suitable for welding.
References Cited (Backward Citations)
US2432616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |